Journal of Food, Agriculture and Environment
Vol 11,
Issue 3&4,2013
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Effects of elevated CO2 on biomass and nutrient allocation in the submerged macrophyte Potamogeton malaianus in Taihu Lake, China
Author(s):
Jiancai Deng *,
Weiping Hu, Xin LiuRecieved Date: 2013-06-28, Accepted Date: 2013-10-04
Abstract:Anthropogenic emissions have led to a sustained 0.5% annual increase in atmospheric carbon dioxide (CO2) levels, which may result in changes to the structure and function of aquatic macrophytes. In this study, the effects of elevated CO2 on the allocation of biomass and nutrient concentrations in the submerged macrophyte Potamogeton malaianus were investigated. Potamogeton malaianus was grown at ambient (350 µmol/mol) and elevated (700 µmol/mol) CO2 concentrations. Elevated CO2 levels significantly decreased the pH (P<0.01) and the concentration of CO32- (P<0.01) in water but increased the concentrations of dissolved CO2 (P<0.01) and HCO3- (P<0.01). The values of external carbonic anhydrase (CA) enzymatic activity were 17.63 and 24.77 g/FW for the ambient and elevated CO2 treatments, respectively, indicating that uptake of HCO3- likely occurred during Potamogeton malaianus photosynthesis. Elevated CO2 levels also increased Potamogeton malaianus root and leaf biomass. Total non-structural carbohydrates (TNC) were predominately in the form of soluble sugars, and the starch fraction of TNC was 22.5% and 21.5% in the root, 38.3% and 40.2% in the stem, and 32.5% and 38.5% in the leaf for the ambient and elevated CO2 environments, respectively. The soluble sugar levels of the root (P<0.05) and starch concentrations in the stem (P<0.05) and leaf (P<0.01) were significantly increased by raising CO2 levels. Compared with ambient CO2, elevated CO2 decreased the total organic nitrogen levels in the root and leaf from 20.4 and 21.5 mg/g to 16.7 and 20.1 mg/g, respectively, while increasing the total root, stem and leaf organic carbon contents by 9.5%, 4.3% and 11.8%, respectively.
Keywords:Elevated CO2,
Potamogeton malaianus, carbonic anhydrase, nutrients, non-structural carbohydratesJournal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2422-2428
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